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Elvsén, Per-Åke
Publications (4 of 4) Show all publications
Sandberg, M., Linden, E., Westerberg, U., Claesson, L. & Elvsén, P.-Å. (2006). Air flow pattern and pressure distribution within a street network in an urban area with a high building area density. In: The 6th International Conference on Urban Climate: Preprints. Paper presented at 6th International Conference on Urban Climate (ICUC6), Göteborg, Sweden, June 12-16, 2006 (pp. 188-191).
Open this publication in new window or tab >>Air flow pattern and pressure distribution within a street network in an urban area with a high building area density
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2006 (English)In: The 6th International Conference on Urban Climate: Preprints, 2006, p. 188-191Conference paper, Published paper (Other academic)
Abstract [en]

We report on the effect of the overall shape of a city on the flow within the street network. We start with a solid round block, aspect ratio, diameter/ height = 6. The block is subdivided into smaller blocks and step by step an increasing number of streets are introduced. In the wind tunnel visualization with helium filled soap bubbled was carried out for obtaining qualitative information about the flow pattern. The pressure distribution on the ground within the street network was recorded in 400 points. CFD predictions provided the overall flow balance; flow entering through the street portals, leaving through the exit street portals and the updraft.

Keywords
Street network, Flow Network, Morphology, District scale
Identifiers
urn:nbn:se:hig:diva-2272 (URN)91-631-9000-1 (ISBN)
Conference
6th International Conference on Urban Climate (ICUC6), Göteborg, Sweden, June 12-16, 2006
Available from: 2007-02-26 Created: 2007-02-26 Last updated: 2018-03-13Bibliographically approved
Elvsén, P.-Å. & Sandberg, M. (2004). Particle Streak Velocimetry for Room Air Flows-Some Improvements. In: Roomvent. Paper presented at Roomvent 2004, 9th International Conference on Air Distribution in Rooms, 5 - 8 September 2004.
Open this publication in new window or tab >>Particle Streak Velocimetry for Room Air Flows-Some Improvements
2004 (English)In: Roomvent, 2004Conference paper, Published paper (Refereed)
Identifiers
urn:nbn:se:hig:diva-871 (URN)
Conference
Roomvent 2004, 9th International Conference on Air Distribution in Rooms, 5 - 8 September 2004
Available from: 2007-12-10 Created: 2007-12-10 Last updated: 2018-03-13Bibliographically approved
Sandberg, M. & Elvsén, P.-Å. (2004). Rapid time varying ventilation flow rates as a mean of increasing the ventilation efficiency. In: Gameiro M. C. Da Silva (Ed.), Roomvent 2004. Paper presented at Roomvent 2004 Coimbra Portugal, 5-8 September 2004 2004.
Open this publication in new window or tab >>Rapid time varying ventilation flow rates as a mean of increasing the ventilation efficiency
2004 (English)In: Roomvent 2004 / [ed] Gameiro M. C. Da Silva, 2004Conference paper, Published paper (Refereed)
Abstract [en]

The paper reports on findings from a series of experiments where the supply flow rate was varied periodically in time. All experiments were conducted in a small scale model with water as operating fluid. The flow was visualised by adding particles to the water and the streaks were recorded with a digital camera. The main result is that there exist variations that generate a role up of the base flow by generation of vortices that are shed into the stagnant region.

Identifiers
urn:nbn:se:hig:diva-874 (URN)
Conference
Roomvent 2004 Coimbra Portugal, 5-8 September 2004 2004
Available from: 2007-12-10 Created: 2007-12-10 Last updated: 2018-03-13Bibliographically approved
Linden, E., Elvsén, P.-Å. & Sandberg, M. (2002). Whole field mapping of temperature pattern in the near zone of an elevated displacement diffuser. In: The 8th International Conference on Air Distribution in Rooms. Paper presented at Roomvent 2002, 8-11 september 2002, Copenhagen, Denmark (pp. 765-768).
Open this publication in new window or tab >>Whole field mapping of temperature pattern in the near zone of an elevated displacement diffuser
2002 (English)In: The 8th International Conference on Air Distribution in Rooms, 2002, p. 765-768Conference paper, Published paper (Other academic)
Abstract [en]

This paper deals with the effect of discharging the air from a diffuser elevated above the floor. The temperatures have been measured and the airflow patterns visualised close to a diffuser for displacement ventilation, results from the whole-field method (using infrared thermography) were images of different colours representing different temperatures of the air close to the diffuser.. The aim of the measurements was to see how the elevations of the diffuser above floor level and the thermal jet length of the supply could affect the near zone.

Identifiers
urn:nbn:se:hig:diva-2484 (URN)
Conference
Roomvent 2002, 8-11 september 2002, Copenhagen, Denmark
Available from: 2007-06-01 Created: 2007-06-01 Last updated: 2018-03-13Bibliographically approved
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